Turning away from a discussion about language and the environment is always difficult for me, but if the conversation also includes talk about fall, I would have no chance of resisting it.
For example, I'm already enjoying the sights, feels, and smells of fall, but when I saw this article from the Mother Nature Network, it pretty much enchanted me. The article looks at the linguistic history that explains why we call this third season of the year either fall or autumn. It is one those little bits of trivia that is not so trivial, especially for a lover of fall, language, and the environment.
Interestingly, as the article shows, the development of language about nature is dependent on our connection with the environment. That's exciting stuff.
To conclude, I should mention that I think autumn is a cooler word but that I usually use fall.